An Experimental and Analytical Study of Periodic and Aperiodic Fluctuations in the Critical Current of Long Coated Conductors

Hu, Xinbo; Rossi, Lídia Aparecida; Stangl, Alexander; Sinclair, John; Kametani, F.; Abraimov, D.; Polyanskii, Anatolii; Coulter, J. Y.; Jaroszyński, J.; Larbalestier, D. C.

doi:10.1109/tasc.2016.2637330

Cited by 20 publications

(22 citation statements)

References 21 publications

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“…REBCO coated conductors have recently become viable for high field superconducting magnet technology, but with such applications come new challenges, particularly in understanding the range of properties that are inherent in such conductors, both tape to tape and along the length of individual tapes [1,2]. Presently REBCO is manufactured as highly textured, thus anisotropic, tapes with substantial angular dependence of the critical transport current (I c ) on the orientation of the applied magnetic field [3].…”

Section: Introductionmentioning

confidence: 99%

Development of general expressions for the temperature and magnetic field dependence of the critical current density in coated conductors with variable properties

Francis

Abraimov

Viouchkov

et al. 2020

Supercond. Sci. Technol.

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REBa 2 Cu 3 O y coated conductors have recently become viable for high field superconducting magnets and this use may be the principal present driver of coated conductor development. Driving the transport critical current density (J c ) as high as possible has become one of the principal goals of CC manufacturers but this can only be done by developing highly engineered nanostructures that may not be easy to control in quantity production of long lengths. Protection of high field (B) magnets operating in the temperature (T) of 4-20 K range is challenging and one key data set needed for accurate quench modeling is a wide-ranging J c (B, T) data set. At the National High Magnetic Field Laboratory (NHMFL), 12 km of REBCO tapes were purchased for the allsuperconducting 32 T user magnet that successfully reached field recently. They were characterized at 4.2 K with field orientation B perpendicular to tape and at 18°off the tape-plane axis. Of the tapes selected for 32 T, three were chosen for additional J c (B, T) characterization from 4.2 to 75 K in the B^tape orientation in fields from 1 to 15 T. Although all tape lengths were bought to the same advanced pinning specification, in fact there was substantial variation of more than 2 in the low temperature, high field J c . Here we probe the reasons for this variability in the context of measurements of the transport J c (B, T) dependence of 3 representative samples from this distribution with Ginzburg-Landau models of vortex pinning using a power law for J c (B) and an exponential temperature dependence for T<45 K and 3 T<B<15 T. A fourth tape from the 32 T magnet procurement with J c outside this range was then selected to test the validity of our modelling. Using this extensive data set, the correlation between J c (B, 4.2 K) and J c (B, T) enabled us to predict J c (B, T) for tapes procured for the 32 T magnet with an expected accuracy of 10% or less for T<40 K and B up to 15 T. Transmission electron microscopy made clear that the BaZrO 3 (BZO) size, volume fraction and density varied significantly across the range of conductors studied, suggesting that nano-structural control is difficult during coated conductor manufacture and that the resulting J c variations may have to be accepted in procurement practice.

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Section: Introductionmentioning

confidence: 99%

Development of general expressions for the temperature and magnetic field dependence of the critical current density in coated conductors with variable properties

Francis

Abraimov

Viouchkov

et al. 2020

Supercond. Sci. Technol.

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“…However it should be pointed out that deliberate APC additions are not necessary for high critical current, in fact STI does not introduce APC, but demonstrated one of the highest critical current. Conversely, APC addition seems to be the cause of the variation in Ic from batch to batch [55].…”

Section: Coated Conductors (Rebco)mentioning

confidence: 88%

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

Uglietti

2019

Supercond. Sci. Technol.

180

123

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High Temperature Superconducting (HTS) materials have the potential to generate magnetic field beyond the level obtainable with Low Temperature Superconducting (LTS). This review reports the past and present R&D on HTS cables and conductors for high field tokamaks, accelerator dipoles and large solenoids. Among the HTS wires and tapes available commercially, coated conductor tapes are the most appealing because of the outstanding critical strength and large improvement margin. Limitations are the weakness against peeling and shearing and the short piece length. The prices for technical superconductors are reviewed because they play an important role in large projects; moreover the perspective of industrial production of HTS wires and tapes is discussed considering the historical development of the LTS wire market. Various designs have been proposed for HTS cables and conductors: some are better suited for soft materials, while others can exploit the anisotropy of coated conductors (by aligning the tape with the field), providing the highest current density. The last decade has seen an increase in the size and complexity of the prototypes; however some peculiar features of HTS, such as high stability margin and high mechanical limits, have not yet been fully incorporated in the designs: for example the transposition requirements for HTS have not yet been studied in detail. Several facts indicate that tapes (even if anisotropic) can be used for manufacturing cables and magnets of any size and have advantages with respect to round wires.

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“…The benefit in term of reliability is significant, as the inhomogeneities in REBCO tape performances typically follow statistical distributions [11,12], so that statistical chance of having a sharp Ic drop for two tapes in parallel carrying a given current is significantly lower than for a single tape carrying the same current. The robustness against local stress-induced defect will be similarly improved.…”

Section: -Validation Of Two-tape Bundle Behavior and Practical Applic...mentioning

confidence: 99%

REBCO Coil With Robust Behavior Against Local Defects Wound Using Two-Tape Bundle

Abe

Badel

Okada

et al. 2022

IEEE Trans. Appl. Supercond.

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REBa2Cu3O7-δ (RE: rare earth/Y) coated conductors have good critical current characteristics under high magnetic fields. Their application to superconducting magnets generating above 25T is under active study. However, performance inhomogeneity along their length may cause damaging hotspots. Adapted winding technologies are needed to mitigate this phenomenon. One of such winding techniques is the twotape bundle co-winding method, where two REBCO tapes are co-wound along with an isolating tape to form the conductor. To test this solution, a double pancake coil was wound with one of the pancakes having an artificially degraded short section on one of the tapes, where the critical current is close to 0. The I-V characteristics of both damages and undamaged pancakes are compared and analyzed based on critical current density Jc(T,B, θ) data, in terms of operation margins. At low voltage levels, similar I-V characteristics for damaged and undamaged pancakes are observed. The behavior is found similar to the expected behavior of a coil whose critical current Ic is locally reduced by 50 %, demonstrating the effectiveness of two-tape bundle for current redistribution in case of local defect, even under high current density.

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An Experimental and Analytical Study of Periodic and Aperiodic Fluctuations in the Critical Current of Long Coated Conductors

Cited by 20 publications

References 21 publications

Development of general expressions for the temperature and magnetic field dependence of the critical current density in coated conductors with variable properties

Development of general expressions for the temperature and magnetic field dependence of the critical current density in coated conductors with variable properties

A review of commercial high temperature superconducting materials for large magnets: from wires and tapes to cables and conductors

REBCO Coil With Robust Behavior Against Local Defects Wound Using Two-Tape Bundle

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